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criu: Add raw fork() implementation

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Glibc has BUG with process creation:
https://sourceware.org/bugzilla/show_bug.cgi?id=21386

It doesn't behave well when parent and child are from
different pid namespaces and have the same pid.

Use raw syscall without glibc's asserts as workaround.

Also, use raw syscall for getpid() in tests too,
as these two function go in the pair (glibc's getpid()
relies on glibc's fork()).

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Kirill Tkhai 2017-05-16 22:45:55 +03:00 committed by Andrei Vagin
parent ad741662b8
commit e997d34b0c
2 changed files with 19 additions and 0 deletions
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9
criu/util.c
View File

@ -1459,3 +1459,12 @@ int getpid()
{
return syscall(__NR_getpid);
}
/*
* In glibc 2.24, fork() may fail when parent and child are
* from different pid namespaces and have the same pid.
*/
pid_t fork()
{
return (pid_t)syscall(__NR_clone, SIGCHLD, 0, NULL, 0, NULL);
}

10
test/zdtm/lib/test.c
View File

@ -296,3 +296,13 @@ void test_waitsig(void)
{
futex_wait_while(&sig_received, 0);
}
pid_t fork()
{
return (pid_t)syscall(__NR_clone, SIGCHLD, 0, NULL, 0, NULL);
}
int getpid()
{
return syscall(__NR_getpid);
}